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Auroral radio emissions at the outer planets: Observations and theories
Zarka, Philippe
We review both observational and theoretical aspects of the generation of auroral radio emissions at the outer planets, trying to organize the former in a coherent frame set by the latter. Important results have been obtained in the past few years on these radio emissions at the five magnetized planets, from the observations of Ulysses at Jupiter …
Spatial structure of the solar wind and comparisons with solar data and models
Hoeksema, J. T.; Galvin, A. B.; Steinberg, J. T. +10 more
Data obtained by instruments on the Ulysses spacecraft during its rapid sweep through >90° of solar latitude, crossing the solar equator in early 1995, were combined with data obtained near Earth by the Wind spacecraft to study the spatial structure of the solar wind and to compare to different models of the interplanetary magnetic field derive…
Heliospheric tomography using interplanetary scintillation observations 2. Latitude and heliocentric distance dependence of solar wind structure at 0.1-1 AU
Jackson, B. V.; Tokumaru, M.; Kojima, M. +4 more
Interplanetary scintillation is a useful means to measure the solar wind in regions inaccessible to in situ observation. However, interplanetary scintillation measurements involve a line-of-sight integration, which relates contributions from all locations along the line of sight to the actual observation. We have developed a computer assisted tomo…
Cross-helicity and residual energy in solar wind turbulence: Radial evolution and latitudinal dependence in the region from 1 to 5 AU
Bavassano, B.; Pietropaolo, E.; Bruno, R.
Solar wind plasma and magnetic field measurements by Ulysses have been used to study magnetohydrodynamic turbulence in different heliospheric regions. Four intervals of six solar rotations have been analyzed. Two of them are on the ecliptic around 2 and 5 AU, respectively, one is at midlatitude near 5 AU, and the last one is at high latitude aroun…
Solar wind radial and latitudinal structure: Electron density and core temperature from Ulysses thermal noise spectroscopy
Moncuquet, Michel; Issautier, Karine; Meyer-Vernet, Nicole +1 more
We present new in situ solar wind plasma measurements obtained during Ulysses fast transit from the south solar pole to the north one, which took place 1 year before the 1996 sunspot minimum. The data were obtained with the radio receiver of the Unified Radio and Plasma Wave Experiment, using the method of quasi-thermal noise spectroscopy, which i…
Overexpanding coronal mass ejections at high heliographic latitudes: Observations and simulations
McComas, D. J.; Riley, Pete; Gosling, J. T. +1 more
Ulysses observations reveal that most coronal mass ejections (CMEs) observed in the solar wind far from the Sun at high heliographic latitudes have large radial widths and are still expanding as they pass the spacecraft. CME radial widths ranging between 0.5 and 2.5 AU have been observed at heliocentric distances between 1.4 and 4.6 AU and at lati…
Ulysses' rapid crossing of the polar coronal hole boundary
Forsyth, R.; Balogh, A.; McComas, D. J. +2 more
The Ulysses spacecraft crossed from the slow dense solar wind characteristic of the solar streamer belt into the fast, less dense flow from the northern polar coronal hole over a very short interval (several days) in late March 1995. The spacecraft, which was at 1.35 AU and ~19° north heliographic latitude, moving northward in its orbit, remained …
Global model of the corona with heat and momentum addition
Wu, S. T.; Poletto, G.; Suess, S. T. +1 more
We have been developing a series of global coronal models directed at a better simulation of empirical coronal hole and streamer properties. In a previous study, a volumetric heat source was used to produce a thin current sheet above streamers and high solar wind speed in the coronal hole. This improved the preexisting coronal structure for corona…
Electron temperature in the solar wind: Generic radial variation from kinetic collisionless models
Issautier, Karine; Meyer-Vernet, Nicole
We calculate analytically the radial profile of the average electron temperature in the solar wind with a kinetic collisionless model. The electron temperature profile at large distances r is the sum of a term ~r-4/3 plus a constant, with both terms of the same order of magnitude near r~1AU. This result is generic as it is weakly depend…
Type III radio source located by Ulysses/Wind triangulation
Kaiser, M. L.; Stone, R. G.; Fainberg, J. +1 more
Radio triangulation from the widely separated Ulysses and Wind spacecraft is used to reconstruct the trajectory of a type III radio burst in the three-dimensional heliosphere. The derived radio trajectory follows a (Parker) spiral path corresponding to a solar wind speed of ~200km/s and progresses to the south of the ecliptic plane. These remote r…